Securing means for reenforced-concrete sleepers



April 14, 1931. E. F. vAGNgux SECURING MEANS FOR REENFORGED CONCRETE SLEEPERS Filed May 27, 1950 3 Sheets-Sheet 1 Fig.2

Fig. 8

A ril 14, 1931. E. F. VAGNEUX 1,800,416

SECURING MEANS FOR REENFORCED CONCRETE SLEEPERS Filed May 27, 1930 3 Sheets-Sheet 2 Hg. lZ

uvvelvrak April 1931- E. F. VAGNEUX 1,800,416

SECURING MEANS FOR REENFORCED CONCRETE SLEEPERS Filed May 27, 1930 5 Sheets-Sheet 3 Hgj/ I 1%QQQRQ Patented Apr. 14, 1931' meant;

PATENT OFFICE EDMOND EBANQOIS Lemue VAQNEUX 9 PARIS. FBANCE sncunr vc. m ssus Eon aEnNFoRoEn-coNcRnTE' SLEEPERS Application filed' May 27, 193Q ,'Seria1 No. 456,223; and in France December 14, 1929.

A commonly used device for securing to reenforced concrete sleepersconsists in using awooden plug or block fitted in the concrete for screwing therein a coach screw or bolt.

;5 F or suitahly anchoring to thesleeper it is necessary for the plug or block to show suflicient resistance against withdrawal, loosenins and bu ti g when he c ach Screw or b s ing scre e the in- In the wooden plugs or blocks used heretoforeresist a ce against bursting is generally Prov d d hl'w l t e d i f one end of the said plug or block inside the concrete which binds hus Qnly t ai Moreover nothing prevents water from passing through cracks which might exist or arise in the wooden plug or block.

My invention has for its object to remove these drawbacks. In the device to be described her ine'iter, h o en lus or b ack wherein the coach screw or bolt is screwed is bound by the concrete at both ends which prov-ides a reliable resistance of the wood a n bur ti g, Moreo er themesor blocks e t in place are coated between their ends with'an insulating putty whichfills inthe ends of the cracks in the wood. e v

To thi e d I v the. r c s in th nr te and the P us s b t i ll s m ap s, vi e i a lish y at th ir ire-er .1 so a to make-the ensea me t f the Pl g easier. -Ihe. difference between the recess and the plug resides inthat the extreme end horizontal cross-sections of the plug tape slightly larger than the. corresponding crosssections of the recess, he-reas-thecontrary is the case for the central crQssisections. Thus the plug being suitably engaged with friction inside its recess, is securely held therein through both ends whereas an empty annular spaceeX-istsbetween the plug and recess towards the middle oftheir length,

I obtain thus an assembly similar to'that shown diagrammatically in Fig. 1 wherein the Plug is shew-i in ull li e and the recess n do t d l ne o a y wa at esempile .I have sho n th i9l s va wher by h Plus erpears with a shape similar to that of atool v handle. I

It is of particular interest to give the plug the shape'off a body of revolution whereby it is possible to secure it by screwing'it into a helical lining fitted in the concrete of the recess. 7 v

In this case I give the surfaces of the recess and of the plug the shape of surfaces 01": revolution the radii of the end sections of the plug being larger than for the recess whereas the central part of the plug is slightly narrower than this recess so as'to make the engagemept of the plug easier and to provide the annular space mentioned hereinabove. is apparent from Fig. 2 that this ineans that the meridian lines- 1 ofthe recess and 2 or the plug being brought to have the same axis and to end in, the same cross-section's, they will intersect at two points 8 and 4.

Obviously in practice I give the curves 1 and 2 suitable simple shapes of which some will be described hereinbelow way of example and shown on accompanym g drawl l F gs. 1 to 7 are d agrams,

v1 shows, as explai ,d, the general shape aplug and its recess,

Hg. 2 shows, also as explained, the general appearance ofthe meridian lines of the recess and of the plug,

"Figs ii and are cross-sections through a iner-idanline of double frusto conical plug and recess," i Fig. 5 shows the lneridan lines of the preceding figures supposed tohe plotted with the same-axis and the same terminal bases, Fig. 6 is a nipdification of the preceding device wherein the plug is a simple frustocone, 7 v

Fig. 7 is anothermodification iyhereinit is therecessQwhich is irustoconical,

Fig. 8 illustrates a further modification wherein the plug is cylindroconical,

Fig. 9 shows in detail a plug acc ordingto' the invention, T T

Fig 10 the drill for recessing the sleeper-s, Fig. 11a rail secured through an ordinary was?! scre l Fig. 12 a rail secured through a bolt coach screw.

In the form of practice shown in Fig. 3, the inner surface of the recess comprises two superposed frustocones 5 and 6 having the same axis and connected along the parallel circles 11, the angle of the generating line of the upper frustocone 6 with the vertical being smaller than for the lower frustocone 5.

Fig. l shows the plug corresponding to this recess; it comprises two frustocones 8 and 9 connected along the parallel circles ll the radius of which is smaller than that of the parallel circle 7 the radii of the upper and lower bases 12 and 13 are on the contrary larger than the corresponding bases of the recess; it is apparent from Fig. 5 which shows the meridian lines of the two preceding figures superposed and plotted with the same axis and the same bases that when the plug is forced into its recess its ends are compresed or, more exactly, bound by the concrete whereas at its central partthere is an annular empty space 14: left between the plug and the concrete.

The shape of one of these elements may be simplified by using for it a simple cone as shown in Figs. 6 and 7. I may also replace one of the frustocones by a cylinder as shown in Fig. 8 where the plug is similar to that of Fig. 4 except in that the lower frustocone 8 is replaced by a cylinder 10.

The angles with the axis of the generating lines have been obviously grossly exaggerated on the above described diagrammatical figures. I have not sh own either thereon the helical grooves provided in the recess and the plug. 7

On the contrary Figs. 9 and show. at a larger scale, a plug and the tool used for recessing the concrete. The plug illustrated in Fig. 9 comprises a lower cylindrical part 15 and above it a frustoconical part 16. It ends with an upper cylindrical part 17 which makes its insertion easier through the agency of a suitable tool. The drill used for shaping the recess comprises (Fig. 10) two frustoconical parts 18 and 19 disposed in a manner" similar to those shown in Fig. 3 and shows an upper terminal cylindrical part 21 which allows an easier handling- 7 The plug is provided with a helical groove 21 and the drill shows also a groove-2O having the same pitch as the plug groove; in the drill groove I fit a steel helix 22 which is firmly held by the concrete when it has set and the drill body is removed through unscrewing.

Fig. 11 shows at the same scale the whole rail anchoring means. The rail 23 restswith the interposition of a wooden support 24 on the concrete'sleeper'25r in this sleeper is provided in the formation thereof a recess through the agency of the above-described drill. The plug 26 of the type shown in Fig. 9 is el'lgaged therein after immersion thereof in a bituminous putty; it is held down by the helical steel part 27 which engages the grooves both of the plug and of its recess. It is apparent that the plug is securely bound by the concrete at both ends whereas the small empty annular gap 28 is filled with the bituminous putty which provides thus in a reliable manner for .watertightness and hydraulic and electric insulation; I screw into the plug thus secured a coach screw 28 the upper end of which bears in the usual manner. against the rail foot which it holds down.

Before securing the coach screw,- the upper cylindrical end 17 of the plugis sawn off; it

however of advantage as shown in the figure to allow the wood to project on the side adjacent to the rail foot whereby it serves as an abutment which prevents any'inclination of the coach screw collar.

Fig. 12 shows in a similar manner a rail held down by a 'coach-screw-bolt 29. In this figure and the preceding one the same reference letters designate the same parts.

In the making of the different parts, the drill and plugs are given a size such that the plugs may be engaged without difficulty until the screwing down 'is nearly at an end at which moment the parts are gradually tightened and the wooden plug is slightly compressedat both ends. V

It is apparent that the plug resists perfectly stresses having a tendency to:

(a) Tear off the helical steel part,

(1)) Cause a bursting of theplug which is prevented by the upper and lower binding,

(0) Unscrew the plugv by reason of the saidbinding and of the adherence of the bituminous putty, 1

Cause electric current leaks and entrance of moisture, owing to the filling in with .putty ofthe cracks in the wood.

The anchorage through a coach screw bolt as shown in Fig12 is of course more satisfactory in the case of a wooden plug as. the fastening stresses are effected on the bolt part and not on the coach-screw part. The coach- 7 screw bolt has been secured once and for all in the wood and there is consequently no possible mechanical wear of the wood through the action of the coach-screw thread. The plug will remainin proper working order as long as its wood/remains sound.

But if it is admissible to replace the" plug as often'as necessary i. e.- assoon as itis ascertained that the coach screw becomes loose,

the much simpler anchoring through an ordinary coach screw may be used.

lVhatIclaim is: Y 1 1. In anchoring means for rails .oncon cretesleepers, the combination ofa vvertically upwardly flaring ,re'cessedspartin the concrete, a cooperating upwardly flaring plug adapted to be'engaged therein, the end horizontal cross-sections of which are slightly larger than those of the recess in the concrete part and the central horizontal cross-sections of which are slightly smaller than the corresponding cross-sectionsof said recess, the recess and the plug being bounded by surfaces of revolution the meridian lines of which are adapted when plotted with the same axes and the same terminal cross-sec tions to intersect twice and rail anchoring means adapted to be held in said plug.

3. In anchoring means for rails on concrete sleepers, the combination of a vertically upwardly flaring recessed part in the concrete, a cooperating upwardly flaring plug adapted tobe engaged therein, the end horizontal cross-sections of which are slightly larger than those of the recess in the concrete part and the central horizontal crosssections of which'are slightly smaller than the corresponding cross-sections of said recess, one of the said flaring parts, recess or plug, having a surface formed of superposed frustocones connected along parallel circles and the other flaring part having a mere frustoconical wall and rail anchoring means adapted to be held in said plug.

4. In anchoring means for rails on concrete sleepers, the combination of a vertically upwardly flaring recessed part in the concrete, a cooperating upwardly flaring plug adapted to be engaged therein, the end horizontal cross-sections of which are slightly larger than those of the recess in the concrete part and the central horizontal cross-sections of which are slightly smaller than the corresponding cross-sections of said recess, a helical groove being provided in the wall of the plug, a helical part securely held in the concrete projecting beyond the recess wall and adapted to engage the groove in the plug, and rail anchoring means adapted to be held in said plug.

5. In anchoring means for rails on concrete sleepers, the combination of a vertically upwardly flaring recessed part in the concrete, a cooperating upwardly flaring plug adapted to be engaged therein, the end horizontal cross-sections of which are slightly larger than those of the recess in the concrete part and the central horizontal crosssections of which are slightly smaller than the corresponding cross-sections of said recess, an insulating bituminous putty impregnating the plug and adapted to fillthe empty annular central space left free between the plug and the recess in the concrete and rail anchoring means adapted to be held in said lug. p In testimony whereof I have aflixed my signature.

EDMOND-FRANCOIS u'aoPou) VAGNEUX. 

